On Mon, Jul 25, 2011 at 05:44:00PM +0800, Shawn Guo wrote:
> It adds device tree probe support for smsc911x driver.
>
> Signed-off-by: Shawn Guo <shawn....@linaro.org>
> Cc: Grant Likely <grant.lik...@secretlab.ca>
> Cc: Steve Glendinning <steve.glendinn...@smsc.com>
> Cc: David S. Miller <da...@davemloft.net>
> ---
> Documentation/devicetree/bindings/net/smsc.txt | 34 +++++++
> drivers/net/smsc911x.c | 123
> +++++++++++++++++++-----
> 2 files changed, 132 insertions(+), 25 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/net/smsc.txt
>
> diff --git a/Documentation/devicetree/bindings/net/smsc.txt
> b/Documentation/devicetree/bindings/net/smsc.txt
> new file mode 100644
> index 0000000..1920695
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/smsc.txt
> @@ -0,0 +1,34 @@
> +* Smart Mixed-Signal Connectivity (SMSC) LAN Controller
> +
> +Required properties:
> +- compatible : Should be "smsc,lan<model>""smsc,lan"
Drop "smsc,lan". That's far too generic.
> +- reg : Address and length of the io space for SMSC LAN
> +- smsc-int-gpios : Should specify the GPIO for SMSC LAN interrupt line
This looks broken. Shouldn't this be specified as a normal
"interrupts" property?
> +- phy-mode : String, operation mode of the PHY interface.
> + Supported values are: "mii", "gmii", "sgmii", "tbi", "rmii",
> + "rgmii", "rgmii-id", "rgmii-rxid", "rgmii-txid", "rtbi", "smii".
> +
> +Optional properties:
> +- smsc,irq-active-high : Indicates the IRQ polarity is active-low
> +- smsc,irq-push-pull : Indicates the IRQ type is push-pull
> +- smsc,register-needs-shift : Indicates the register access needs shift
> +- smsc,access-in-32bit : Indicates the access to controller is in 32-bit
> + mode
Currently, reg-io-width and reg-shift are being used to manipulate
register access on ns16550 serial ports. The same thing can be used
here. See bindings/tty/serial/of-serial.txt
> +- smsc,force-internal-phy : Forces SMSC LAN controller to use
> + internal PHY
> +- smsc,force-external-phy : Forces SMSC LAN controller to use
> + external PHY
I would expect using an external phy would also expect a phy-device
property to connect to the phy node.
> +- smsc,save-mac-address : Indicates that mac address needs to be saved
> + before resetting the controller
> +- local-mac-address : 6 bytes, mac address
> +
> +Examples:
> +
> +lan9220@f4000000 {
> + compatible = "smsc,lan9220", "smsc,lan";
> + reg = <0xf4000000 0x2000000>;
> + phy-mode = "mii";
> + smsc-int-gpios = <&gpio1 31 0>; /* GPIO2_31 */
> + smsc,irq-push-pull;
> + smsc,access-in-32bit;
> +};
> diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
> index b9016a3..0097048 100644
> --- a/drivers/net/smsc911x.c
> +++ b/drivers/net/smsc911x.c
> @@ -53,6 +53,10 @@
> #include <linux/phy.h>
> #include <linux/smsc911x.h>
> #include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_net.h>
> #include "smsc911x.h"
>
> #define SMSC_CHIPNAME "smsc911x"
> @@ -2095,25 +2099,67 @@ static const struct smsc911x_ops shifted_smsc911x_ops
> = {
> .tx_writefifo = smsc911x_tx_writefifo_shift,
> };
>
> +#ifdef CONFIG_OF
> +static int __devinit smsc911x_probe_config_dt(
> + struct smsc911x_platform_config *config,
> + struct device_node *np)
> +{
> + const char *mac;
> +
> + if (!np)
> + return -ENODEV;
> +
> + config->phy_interface = of_get_phy_mode(np);
> +
> + mac = of_get_mac_address(np);
> + if (mac)
> + memcpy(config->mac, mac, ETH_ALEN);
> +
> + if (of_get_property(np, "smsc,irq-active-high", NULL))
> + config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;
> +
> + if (of_get_property(np, "smsc,irq-push-pull", NULL))
> + config->irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL;
> +
> + if (of_get_property(np, "smsc,register-needs-shift", NULL))
> + config->shift = 1;
> +
> + if (of_get_property(np, "smsc,access-in-32bit", NULL))
> + config->flags |= SMSC911X_USE_32BIT;
> +
> + if (of_get_property(np, "smsc,force-internal-phy", NULL))
> + config->flags |= SMSC911X_FORCE_INTERNAL_PHY;
> +
> + if (of_get_property(np, "smsc,force-external-phy", NULL))
> + config->flags |= SMSC911X_FORCE_EXTERNAL_PHY;
> +
> + if (of_get_property(np, "smsc,save-mac-address", NULL))
> + config->flags |= SMSC911X_SAVE_MAC_ADDRESS;
> +
> + return 0;
> +}
> +#else
> +static inline int smsc911x_probe_config_dt(
> + struct smsc911x_platform_config *config,
> + struct device_node *np)
> +{
> + return -ENODEV;
> +}
> +#endif /* CONFIG_OF */
> +
> static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
> {
> + struct device_node *np = pdev->dev.of_node;
> struct net_device *dev;
> struct smsc911x_data *pdata;
> struct smsc911x_platform_config *config = pdev->dev.platform_data;
> struct resource *res, *irq_res;
> unsigned int intcfg = 0;
> - int res_size, irq_flags;
> - int retval;
> + int irq_gpio, res_size, irq_flags = 0;
> + int retval = 0;
>
> pr_info("Driver version %s\n", SMSC_DRV_VERSION);
>
> - /* platform data specifies irq & dynamic bus configuration */
> - if (!pdev->dev.platform_data) {
> - pr_warn("platform_data not provided\n");
> - retval = -ENODEV;
> - goto out_0;
> - }
> -
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> "smsc911x-memory");
> if (!res)
> @@ -2125,13 +2171,6 @@ static int __devinit smsc911x_drv_probe(struct
> platform_device *pdev)
> }
> res_size = resource_size(res);
>
> - irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> - if (!irq_res) {
> - pr_warn("Could not allocate irq resource\n");
> - retval = -ENODEV;
> - goto out_0;
> - }
> -
This should still work for the device-tree situation. Why remove it?
> if (!request_mem_region(res->start, res_size, SMSC_CHIPNAME)) {
> retval = -EBUSY;
> goto out_0;
> @@ -2148,26 +2187,53 @@ static int __devinit smsc911x_drv_probe(struct
> platform_device *pdev)
>
> pdata = netdev_priv(dev);
>
> - dev->irq = irq_res->start;
> - irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
> - pdata->ioaddr = ioremap_nocache(res->start, res_size);
> -
> - /* copy config parameters across to pdata */
> - memcpy(&pdata->config, config, sizeof(pdata->config));
> + if (np) {
> + irq_gpio = of_get_named_gpio(np, "smsc-int-gpios", 0);
> + retval = gpio_request_one(irq_gpio, GPIOF_IN, "smsc-int-gpio");
> + if (!retval)
> + dev->irq = gpio_to_irq(irq_gpio);
Yeah, that's definitely the wrong way to handle this. If the
device it wired to a gpio controller, then the gpio controller also
need to be an interrupt controller to ensure that it can map interrupt
numbers.
> + } else {
> + irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + if (irq_res) {
> + dev->irq = irq_res->start;
> + irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
> + } else {
> + retval = -ENODEV;
> + }
> + }
>
> - pdata->dev = dev;
> - pdata->msg_enable = ((1 << debug) - 1);
> + if (retval) {
> + SMSC_WARN(pdata, probe, "Error smsc911x irq not found");
> + retval = -EINVAL;
> + goto out_free_netdev_2;
> + }
>
> + pdata->ioaddr = ioremap_nocache(res->start, res_size);
> if (pdata->ioaddr == NULL) {
> SMSC_WARN(pdata, probe, "Error smsc911x base address invalid");
> retval = -ENOMEM;
> goto out_free_netdev_2;
> }
>
> + pdata->dev = dev;
> + pdata->msg_enable = ((1 << debug) - 1);
> +
> + retval = smsc911x_probe_config_dt(&pdata->config, np);
> + if (retval && config) {
> + /* copy config parameters across to pdata */
> + memcpy(&pdata->config, config, sizeof(pdata->config));
> + retval = 0;
> + }
> +
> + if (retval) {
> + SMSC_WARN(pdata, probe, "Error smsc911x config not found");
> + goto out_unmap_io_3;
> + }
> +
> /* assume standard, non-shifted, access to HW registers */
> pdata->ops = &standard_smsc911x_ops;
> /* apply the right access if shifting is needed */
> - if (config->shift)
> + if (pdata->config.shift)
> pdata->ops = &shifted_smsc911x_ops;
>
> retval = smsc911x_init(dev);
> @@ -2314,6 +2380,12 @@ static const struct dev_pm_ops smsc911x_pm_ops = {
> #define SMSC911X_PM_OPS NULL
> #endif
>
> +static const struct of_device_id smsc_dt_ids[] = {
> + { .compatible = "smsc,lan", },
As mentioned above, "smsc,lan" is far too generic.
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, smsc_dt_ids);
> +
> static struct platform_driver smsc911x_driver = {
> .probe = smsc911x_drv_probe,
> .remove = __devexit_p(smsc911x_drv_remove),
> @@ -2321,6 +2393,7 @@ static struct platform_driver smsc911x_driver = {
> .name = SMSC_CHIPNAME,
> .owner = THIS_MODULE,
> .pm = SMSC911X_PM_OPS,
> + .of_match_table = smsc_dt_ids,
> },
> };
>
> --
> 1.7.4.1
>
>
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